I only flash to stock when I go in for service as I got he ESP plan tossed in when I bought so they do all the service.
As for the guys that screwed on the injectors...ack
They would have had to rmoved from the service dept with some crap like that.
Maybe Bill can pop in here and give a definate answer. This very question in my head is why I have never used teh canned tunes on any of the tuners....
Guess I am just paranoid..